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authorLinus Torvalds <torvalds@linux-foundation.org>2023-07-16 13:22:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2023-07-16 13:22:08 -0700
commitf61a89ca1182c43aa7a141c40f4063be81bd2562 (patch)
treea5624c3895a214223b6e8366a2e95c98bd96bf34 /kernel
parentede950b01922778ade5ba0d0834f25fca4ed1d88 (diff)
parentaff037078ecaecf34a7c2afab1341815f90fba5e (diff)
Merge tag 'sched_urgent_for_v6.5_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fixes from Borislav Petkov: - Remove a cgroup from under a polling process properly - Fix the idle sibling selection * tag 'sched_urgent_for_v6.5_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/psi: use kernfs polling functions for PSI trigger polling sched/fair: Use recent_used_cpu to test p->cpus_ptr
Diffstat (limited to 'kernel')
-rw-r--r--kernel/cgroup/cgroup.c2
-rw-r--r--kernel/sched/fair.c2
-rw-r--r--kernel/sched/psi.c29
3 files changed, 23 insertions, 10 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index bfe3cd8ccf36..f55a40db065f 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -3730,7 +3730,7 @@ static ssize_t pressure_write(struct kernfs_open_file *of, char *buf,
}
psi = cgroup_psi(cgrp);
- new = psi_trigger_create(psi, buf, res, of->file);
+ new = psi_trigger_create(psi, buf, res, of->file, of);
if (IS_ERR(new)) {
cgroup_put(cgrp);
return PTR_ERR(new);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index a80a73909dc2..b3e25be58e2b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7174,7 +7174,7 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target)
recent_used_cpu != target &&
cpus_share_cache(recent_used_cpu, target) &&
(available_idle_cpu(recent_used_cpu) || sched_idle_cpu(recent_used_cpu)) &&
- cpumask_test_cpu(p->recent_used_cpu, p->cpus_ptr) &&
+ cpumask_test_cpu(recent_used_cpu, p->cpus_ptr) &&
asym_fits_cpu(task_util, util_min, util_max, recent_used_cpu)) {
return recent_used_cpu;
}
diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
index 81fca77397f6..9bb3f2b3ccfc 100644
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -493,8 +493,12 @@ static u64 update_triggers(struct psi_group *group, u64 now, bool *update_total,
continue;
/* Generate an event */
- if (cmpxchg(&t->event, 0, 1) == 0)
- wake_up_interruptible(&t->event_wait);
+ if (cmpxchg(&t->event, 0, 1) == 0) {
+ if (t->of)
+ kernfs_notify(t->of->kn);
+ else
+ wake_up_interruptible(&t->event_wait);
+ }
t->last_event_time = now;
/* Reset threshold breach flag once event got generated */
t->pending_event = false;
@@ -1271,8 +1275,9 @@ int psi_show(struct seq_file *m, struct psi_group *group, enum psi_res res)
return 0;
}
-struct psi_trigger *psi_trigger_create(struct psi_group *group,
- char *buf, enum psi_res res, struct file *file)
+struct psi_trigger *psi_trigger_create(struct psi_group *group, char *buf,
+ enum psi_res res, struct file *file,
+ struct kernfs_open_file *of)
{
struct psi_trigger *t;
enum psi_states state;
@@ -1331,7 +1336,9 @@ struct psi_trigger *psi_trigger_create(struct psi_group *group,
t->event = 0;
t->last_event_time = 0;
- init_waitqueue_head(&t->event_wait);
+ t->of = of;
+ if (!of)
+ init_waitqueue_head(&t->event_wait);
t->pending_event = false;
t->aggregator = privileged ? PSI_POLL : PSI_AVGS;
@@ -1388,7 +1395,10 @@ void psi_trigger_destroy(struct psi_trigger *t)
* being accessed later. Can happen if cgroup is deleted from under a
* polling process.
*/
- wake_up_pollfree(&t->event_wait);
+ if (t->of)
+ kernfs_notify(t->of->kn);
+ else
+ wake_up_interruptible(&t->event_wait);
if (t->aggregator == PSI_AVGS) {
mutex_lock(&group->avgs_lock);
@@ -1465,7 +1475,10 @@ __poll_t psi_trigger_poll(void **trigger_ptr,
if (!t)
return DEFAULT_POLLMASK | EPOLLERR | EPOLLPRI;
- poll_wait(file, &t->event_wait, wait);
+ if (t->of)
+ kernfs_generic_poll(t->of, wait);
+ else
+ poll_wait(file, &t->event_wait, wait);
if (cmpxchg(&t->event, 1, 0) == 1)
ret |= EPOLLPRI;
@@ -1535,7 +1548,7 @@ static ssize_t psi_write(struct file *file, const char __user *user_buf,
return -EBUSY;
}
- new = psi_trigger_create(&psi_system, buf, res, file);
+ new = psi_trigger_create(&psi_system, buf, res, file, NULL);
if (IS_ERR(new)) {
mutex_unlock(&seq->lock);
return PTR_ERR(new);